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Tag: dotnet-10

68 posts · Page 1 of 7

2026-09-16 errors dotnet dotnet-10

Fix: UIKitThreadAccessException from MediaPicker.PickPhotosAsync when selecting multiple photos in .NET MAUI iOS

Picking 2 or more photos on iOS throws UIKitThreadAccessException in MAUI 10.0.100 and 10.0.101. MAUI reads PHPickerResult.ItemProvider after an await, off the main thread. Pin 10.0.90, upgrade to 10.0.110, or use a PHPicker shim.

2026-09-15 errors aspnetcore dotnet-10

Fix: ASP.NET Core API endpoints return 401 instead of redirecting to the login page after upgrading to .NET 10

In .NET 10 cookie auth answers API-style endpoints with 401/403 instead of a login redirect. Restore it per endpoint, globally, or with an AppContext switch.

2026-09-15 errors ef-core ef-core-11

Fix: EF Core MigrateAsync and CanConnectAsync keep retrying on 'Login failed for user' for 60 seconds

EF Core's SQL Server existence check retries error 18456 for a full minute, with or without EnableRetryOnFailure. Fail fast, cap RetryTimeout, or wait for EF Core 12.

2026-09-13 dotnet-maui android r8

How to enable R8 shrinking and obfuscation for a .NET MAUI Android release build

Set AndroidLinkTool to r8, keep trimming on, and add a ProguardConfiguration file. Why .NET 10 and .NET 11 RC 1 still ship un-obfuscated Java, how the new AndroidR8ObfuscationMode property changes that, and how to verify R8 actually ran.

2026-09-13 dotnet-maui android maui-shell

How to intercept the Android back button on a .NET MAUI Shell root page

Override OnBackButtonPressed on the root page and run .NET MAUI 10.0.101 or later. Why root pages stopped receiving back presses from 10.0.70 (Android 16) and 10.0.100 (every Android version), why .NET 11 RC 1 is still affected, why Shell.OnNavigating and BackButtonBehavior.Command do not help, and a MainActivity workaround for the broken versions.

2026-09-10 errors blazor blazor-webassembly

Fix: IsAuthenticated is false and RemoteUserAccount is null in Blazor WebAssembly after an MSAL upgrade

Microsoft.Authentication.WebAssembly.Msal 10.0.8, 9.0.16 and 8.0.27 moved to msal.js 4, whose async init races itself. Initialize MSAL once in Program.cs, or pin 10.0.7.

2026-09-10 errors ef-core ef-core-11

Fix: PublishAot plus EFOptimizeContext exhausts memory during an EF Core build

EF Core's build-time model generation re-entered MSBuild until RAM ran out. Upgrade Tasks and Design to 10.0.10+, and on EF Core 11 delete EFOptimizeContext.

2026-09-09 errors ef-core ef-core-11

Fix: AS JSON option can be specified only for column of nvarchar(max) type in WITH clause

EF Core emits [col] json '$.path' AS JSON inside OPENJSON WITH, which Azure SQL rejects with Msg 13618. Upgrade to EF Core 10.0.11+, or drop the provider compatibility level to 160.

2026-09-09 errors ef-core ef-core-11

Fix: Complex entry original ordinal '-1' is invalid when saving a ToJson complex collection

Upgrade Microsoft.EntityFrameworkCore to 10.0.10 or later. Before that, growing a nested collection under a second ToJson complex property crashed SaveChanges.

2026-09-09 errors ef-core ef-core-11

Fix: The complex type collection must be initialized to a non-null value

On EF Core 10.0.x, nulling a complex property that holds a two-element collection inside a ToJson complex collection breaks DetectChanges. Fixed in 11.0.0-rc.1.